The Learjet 55 was Learjet's entry into the medium-sized business jet field. In designing the 55, Learjet utilizes the earlier Longhorn 28/29 wing with winglets and marries it to a larger fuselage. The step-down aisle in the cabin has 5 feet 9 inches of headroom. Power is supplied by two Honeywell TFE 731 engines that produce 3,700 pounds of thrust each. The 55C comes equipped with delta fins that improve performance and handling.
The first production aircraft flew on August 11, 1980.
